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In the presence of X, ZnO develops a lig...

In the presence of X, ZnO develops a light blue colouration in `CH_(3)COOH`, X is -

A

`K_(4)[Fe(CN)_(6)]`

B

`K_(3)[Fe(CN)_(6)]`

C

`Na_(2)[Fe(CN)_(5)NO]`

D

`[Fe(CO)_(5)]`

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The correct Answer is:
A
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At 25^(@)C , the molar conductivity of an infinitely dilute solution of CH_(3)COOH is "390.8 ohm"^(-1)"cm"^(2)"mol"^(-1) . At the same temperature, if the degree of ionisation of CH_(3)COOH in its aqueous solution at a given concentration is 3.5% , then the molar conductivity of the solution would be -

Give the mechanism of cyanohydrin formation when carbonyl compounds react with HCN in the presence of alkali. (b) Why CH_(3)CHO is more reactive than CH_(3)COCH_(3) towards reaction with HCN ?

What colour change does a blue or red litmus paper exhibit when it is put separately in each of the following aqueous solutions ? CH_(3)COONa .

What colour change does a blue or red litmus paper exhibit when it is put separately in each of the following aqueous solutions ? CH_(3)COONH_(4) .

Write down the relation between DeltaH and DeltaU for the following reaction: CH_(3)COOH(aq)+NaOH(aq)to CH_(3)COON(aq)+H_(2)O(l) .

Determine the pH of a buffer solution consisting of 0.01(M) CH_(3)COOH and 0.03(M)" "CH_(3)COONa. Given: K_(a)(CH_(3)COOH)=1.8xx10^(-5) .

The ratio of volumes of CH_3COOH 0.1 (N) to CH_3COONa 0.1 (N) required to prepare a buffer solution of pH5.74 is (given: pKa of CH_3COOH is 4.74)

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CHHAYA PUBLICATION-D - AND F - BLOCK ELEMENTS -MCQ (Single Correct Type)
  1. Among the following, the non - stoichiometric compounds are -

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  2. At pH = 12, Cr(2)O(7)^(2-) changes to -

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  3. In the presence of X, ZnO develops a light blue colouration in CH(3)CO...

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  4. The order of increasing basicity of TiO(2), Zro(2) & HfO(2) is -

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  5. The reaction between NH(4)Cl solution and alkaline Nessler's reagent f...

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  6. Ti^(2+) is brown while Ti^(4+) is colourless, because -

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  7. If excess of KCN is added to a solution containing Cu^(2+) and Cd^(2+)...

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  8. Which one of the following precipitate is not white -

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  9. The salt of the d - block element that is used as a catalyst in the di...

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  10. The metal chloride that responds to the chromyl chloride test is -

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  11. Theamount of nickel present in steel, used in the manufacture of pendu...

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  12. The formula of mangano - manganic oxide resembles to -

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  13. The value of magnetic moment is the same for -

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  14. In dichromate ion, the measure of Cr - O - Cr angle is -

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  15. The number of electrons present in the 5f - orbital in the ground stat...

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  16. Gold dissolves in aqua regia to form -

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  17. A chocolate - brown precipitate is obtained when acetic acid and potas...

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  18. The aqueous solutions having the same colour are observed in case of -

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  19. Free silver metal reacts with NaCN and forms a water soluble complex i...

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  20. In alkaline medium, MnO(4)^(-) oxides I^(-) to -

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